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From reading this thread it appears that, including BB's, the 170mm BB30 compact I just ordered for my wife's bike will be within 1g of my old THM Clavicula BSA 175mm using the same rings. This is truly appalling. Maybe I miscalculated....

Could someone do me a favor and weigh just the left-side arm/spindle of a BB30 style crank? A scale picture would be best. I ask because I am running a Quarq on an BB30 S900 and I am wondering how much weight I could save by using a Red crank on the left side. Also, does anyone know if this combo would work? Would the left/right arms be 180 degrees?

I'm also not sure how the end shot of the spline weighs an extra 2 grams than the side on shot but should help you determine if the cranks would line up okay. (Maybe you should average them to a 179g without the lockring.)

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